package com.jzwl.common.security;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

public class CustomFilterSecurityInterceptor extends AbstractSecurityInterceptor implements Filter {

	private FilterInvocationSecurityMetadataSource securityMetadataSource;
	
	/**
	 * Method that is actually called by the filter chain. Simply delegates to
	 * the {@link #invoke(FilterInvocation)} method.
	 * @param request the servlet request
	 * @param response the servlet response
	 * @param chain the filter chain
	 * @throws IOException if the filter chain fails
	 * @throws ServletException if the filter chain fails
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(request, response, chain);
		invoke(fi);
	}

	public void invoke(FilterInvocation fi) throws IOException, ServletException {
		// object为FilterInvocation对象  
        //super.beforeInvocation(fi);//源码  
        // 1.获取请求资源的权限  
         //执行 
		//Collection<ConfigAttribute> attributes =   
        //                securityMetadataSource.getAttributes(fi);  
        // 2.是否拥有权限  
        //this.accessDecisionManager.decide(authenticated, fi, attributes); 

		InterceptorStatusToken token = super.beforeInvocation(fi);
		try {
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
			
		} catch (Exception e) {
			logger.error(e.getStackTrace());
			e.printStackTrace();
		} finally {
			super.afterInvocation(token, null);
		}
	}

	public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
		return this.securityMetadataSource;
	}

	public Class<? extends Object> getSecureObjectClass() {
		return FilterInvocation.class;
	}

	public SecurityMetadataSource obtainSecurityMetadataSource() {
		return this.securityMetadataSource;
	}

	public void setSecurityMetadataSource(FilterInvocationSecurityMetadataSource newSource) {
		this.securityMetadataSource = newSource;
	}

	public void destroy() {

	}

	public void init(FilterConfig arg0) throws ServletException {

	}

}
